Additional Physics – Forces L/O :- To know what affects the resistance in a circuit “Resistance is futile!” Exam Date -

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Presentation transcript:

Additional Physics – Forces L/O :- To know what affects the resistance in a circuit “Resistance is futile!” Exam Date -

Quick quiz What is the equation for work done? What affects your momentum? How do you work out speed? What 2 equations can you use to work out acceleration? What is acceleration measured in? What is the equation for work done and what is it measured in? What is Hooke’s law? What is the equation for working out current? Name 3 things which can affect stopping distance

Can you remember what these symbols mean? Heater Fuse Motor Transformer LED (light emitting diode) Diode Lamp Generator

Resistance Electrons passing through a bulb have to push their way through lots of vibrating ions in the metal filament. The ions resist the passage of electrons through the bulb Resistance = Potential difference (volts) (ohms) Current (amperes)

What is electrical resistance? What do you think affects the resistance of a wire? Write a hypothesis to investigate?

What affects the resistance of a wire? Hypothesis Prediction Independent variable = Dependent variable = Method Equipment

IndependentVoltage (V) Current (A) Resistance (Ω) Gather your results and graph these. You will be expected to tell the class what patterns you found in your results at the end of the lesson Independent Variable Resistance ( Ω )

Do your results support your prediction? What do the results of the rest of the class tell you about what affects the resistance of a wire?

Do your results follow ohm’s law? Ohm’s Law The current through a resistor at constant temperature is directly proportional to the potential difference across the resistor If not, why not?

What have you learnt? Do you know the equation for resistance? Can you explain what resistance is? Do you know what affects resistance?